Template:Short description Template:About A postscript (P.S., PS, PS.) may be a sentence, a paragraph, or occasionally many paragraphs added, often hastily and incidentally, after the signature of a letter<ref>Template:Cite book §21 p. 33</ref> or (sometimes) the main body of an essay or book. The term comes from the Latin post scriptum, an expression meaning "written after"<ref>Template:Cite book</ref><ref>Template:Cite book</ref> (which may be interpreted in the sense of "that which comes after the writing").<ref>Template:Cite news</ref> In a book or essay, a more carefully composed addition (e.g., for a second edition) is called an afterword. The word "postscript" has poetically been used to refer to any sort of addendum to some main work even if it is not attached to a main work, for example Søren Kierkegaard's book titled Concluding Unscientific Postscript.
Sometimes when additional points are made after the first postscript, abbreviations such as P.P.S. (post-post-scriptum) and P.P.P.S. (post-post-post-scriptum) and so on are added, ad infinitum.